Most of the houses we get called to were built between 1938 and 1988, with the bulk of that stock going up in the 1960s and 70s, spread across 52 named neighborhoods in this service area. That means a lot of original torsion springs are pushing sixty years old, or close to it. Steel doesn't care what decade it is - it fatigues on a cycle count, and a spring installed when a house was framed in 1962 has had a long time to work through that cycle. We see this most on the older side-mount and center-mount setups that came standard on houses from that era. Newer opener kits get bolted onto the same original spring shaft because nobody thought to swap the spring when they upgraded the motor. So the door looks modern from the driveway and the spring underneath it is not. This is the baseline for almost every spring call we take: not a defect, just age catching up with hardware nobody replaced because it never announced itself until it snapped.
This is a mild temperate climate, not a place with hard freezes, so we don't get the ice-and-thaw spring failures you'd see somewhere with real winters. What we do get is a steady, narrow temperature band that doesn't stress steel the way big swings do - until a cooler stretch hits a spring that's already near the end of its cycle life. A spring at cycle 9,800 out of a 10,000-cycle rating doesn't need a hard freeze to go. It needs one cold morning where the metal contracts just enough to finish the fatigue crack that's been forming for years. That's why spring failures here cluster on cold mornings even though the town never sees a true freeze - the temperature drop is small, but it's the last push on a spring that was already compromised by decades of cycling in houses built in the 1938-1988 window. The mild climate is actually part of why so many original springs have lasted this long. They just haven't been tested the way they would somewhere harsher, so when they do go, it often catches an owner off guard.
I'm not going to quote a number here because it depends on what's on the door - torsion versus extension, single spring versus a matched pair, whether the drums and cables need to come off too. What I can tell you is that houses in this service area tend to have higher household incomes than a lot of nearby markets, and that shows up in what people choose: more owners here opt to replace both springs on a double door at once rather than patch one side, even when only one has failed, because they'd rather not pay for a second truck visit in six months. That's a judgment call, not a rule. If your spring is original to a house built in the early 60s, the other one is the same age, and it's reasonable to plan for both. If the door itself is getting old too - worn rollers, a track that's been packed with grease for decades - sometimes the honest conversation is about the door, not just the spring.
Because this is a mild climate without sharp seasonal extremes, we don't see the late-winter rush that colder cities get. What we see instead is a slower, steadier pattern of failures tied more to the age of the housing stock than to the calendar. A spring installed in a house built in 1962 doesn't know what month it is - it knows how many times it's been stretched and released. That said, the cooler months here still see a bump in calls, just a modest one, because the small temperature drop is enough to tip a spring that was already near its limit. If you own a house from that 1938-1988 window and the spring has never been replaced, the smart move is getting it looked at before a cool morning makes the decision for you.
It doesn't take a hard freeze - this is a mild temperate climate, so we don't get extreme cold. But a spring near the end of its cycle life only needs a small temperature drop to finish a fatigue crack that's been forming for years. Age and cycle count matter more here than weather severity.
If your house was built between 1938 and 1988, which covers most of this area, and nobody has a record of a spring replacement, assume it's original or close to it. A tech can tell you the wind count and coil condition on-site, but the house's build date is the first clue.
If both springs are the same age, which is common in houses from the 1960s-70s stock that makes up most of this area, we usually recommend replacing both. One going tells you the other is close behind. It's a judgment call based on the door, not a fixed rule.
We cover this service area including places like Daly City, Colma, Brisbane, and South San Francisco, all within about seven to nine miles. Call to confirm your address is in range.
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